Funding for this research was provided by:
Medical Research Council (MR/M003191/1)
Received: 4 October 2018
Revised: 21 December 2018
Accepted: 3 January 2019
First Online: 29 January 2019
Compliance with ethical standards
: SKP has received honoraria for talks from Bayer Schering. XZ is an employee of Siemens Healthcare. DF has received research support from Siemens. The remaining authors declare that they have no conflict of interest.
: All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.
: Informed consent was obtained from all individual participants included in the study.